Telephone-transmitter.



PATENTED JUNE 30, 1903.

M. WEISSER. TELEPHONE TRANSMITTER.

APPLICATION FILED JAN. 11, 1902.

N0 MODEL.

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UNITED STATES Patented June 30, 1903.

MATHIAS WEISSER, OF MILWAUKEE, \VISCONSIN.

TELEPHONE-TRANSMITTER.

SPECIFICATION forming part of Letters Patent N 0. 732,147, dated. June30, 1903 Application filed January 11, 1902. Serial No. 89,253. Nomodel.)

To aZZ whom it may concern.-

Be it known that I, MATHIAs WEISSER, a citizen of the United States,residing at Milwaukee, county of Milwaukee, and State of Wisconsin, haveinvented new and useful Improvements in Telephone-'Iransmitters, ofwhich the following is a specification.

My invention relates to improvements in telephone-transmitters.

In telephone-transmitters as herefore constructed the electric circuitbetween the transfected by the conditions of the metallic dia-.

phragm in the respects named, while owing to the fact that the metallicdiaphragm isinsulated, cushioned by rubber or other nonmetallicsubstances, the sharp unpleasant sounds heretofore produced by contactof two moving metallic surfaces are avoided and the voice of the user asreproduced is consequently fuller and more natural.

My invention is further explained by reference to the accompanyingdrawings, in which-- Figure 1 represents a central vertical section, andFig, 2 represents a rear view with the shell removed.

Like parts are identified by the same ref erence-letters in both views.

The body A, mouthpiece B, the supportingarm C, the spider or bracket D,byvwhich the body A is supported from said arm 0, the carbon block E, asadjustably supported from the hub F of the bracket by the screw G, andsleeve H have all been previously used in various combinations in theconstruction of a telephone-transmitter and are not broadly claimed inthis application.

The present invention pertains-more especially to the manner ofinsulating the metallic diaphragm I at its periphery from theretaining-bearings of the body A by the annular collar or packing-ringJ, formed of any suitable insulating material, and also to the manner ofinsulating said diaphragm from the carbon diaphragm K by aninsulatingdisk L, which is located between said metallic dia phragm Iand said carbon disk, and it also further pertainsto the mannerofforming the electric circuit between'the two wires leading from thetelephone-receiver, as shown, through the carbon diaphragm K andgranulated carbon packing M and the other electric connections formingthe circuit without being brought into electrical connection with saidmetallic diaphragm, whereby the metallic sound heretofore caused by thedirect contact of the metallic bearing against the mov ing metallicdiaphragm is avoided. To accomplisll this object, it becomes necessarysimply to insulate said metallic diaphragm atits periphery and center,as stated, and conmeet one branch N of said electric circuit with saidcarbon disk K and the other branch 0 of said electric circuit with anymetallic part of the transmitter which is electrically connected withthe supporting-bearings of the carbon block E, whereby the electriccircuit will be formed through said carbon diaphragm and granulatedcarbon and said carbon block. The branch N of the electric circuit isheld in contact with the carbon diaphragm by one of the elastic arms P,three of said arms P being employed to hold said carbon diaphragm K inplace, which arm is insulated from said branch by a yielding packing R.

It will be understood that the granulated carbon M is retained in placebetween the carbon diaphragm K and the carbon blockE by a yieldingcushion S, which is formed of felt or any similar soft material. It willalso be understood that said cushion and granulated carbon are adjustedto bear with greater or less pressure against said carbon disk by theadjustment of the sleeve H in the hub F. To accomplish this object, theset-screw T is released from contact with said adjustable sleeve H whensaid sleeve is moved toward the right or left in its bearings until thedesired adjustment'is attained, when said setscrew is turned downagainst said sleeve, whereby said parts are retained at the desiredpoint of adjustment.

Having thus described my invention, What I claim as new, and desire tosecure by Letters Patent, is-- 1. In the class of telephone-transmittersherein described, the combination of a m etallic diaphragm; asupporting-bearing therefor; a carbon block; an intermediate packing ofgranulated carbon; a carbon disk; and a packing insulating said metallicdiaphragm from its supporting-bearings and said carbon disk andgranulated packing, as set forth.

2. A telephone-transmitter, comprising a supporting-arm; a bracketsupported from said arm; a body portion and mouthpiece supported fromthe arms of said bracket; a carbon block and a granulated-carbon packingcentrally supported from the hub of said bracket; a metallic diaphragmhaving insulating-bearings in said body portion; an insulating-disklocated against the rear surface of said metallic diaphragm; and acarbon diaphragm interposed between said insulating-disk and saidpacking of granulated carbon, substantially as and for the purposespecified. v

3. A telephone-transmitter, comprising a supporting-arm; a bracketsupported from said arm; a bodyportion and mouthpiece supported from thearms of said bracket; a carbon block and a granulated-carbon packingcentrally supported from the hub of said bracket; a metallic diaphragmhaving insulating-bearings in said body portion; an insulating-disklocated against the rear surface of said metallic diaphragm; a carbondiaphragm interposed between said insulating-disk and said packing ofgranulated carbon; an electric circuit having one of its brancheselectrically connected with said carbon diaphragm, and its other armelectrically connected with the supporting-bearings of the carbon block,whereby the electric circuit is formed through said transmitter withoutpassing through said metallic diaphragm, as set forth.

In testimony whereof I affix my signature in the presence of twoWitnesses.

MATHIAS WEISSER.

Witnesses:

Ms B. ERWIN, O. L. Roman.

